Knife



Dec. 3, 1935. F. E. EDGREN ET A1.

KNIFE Filed oct. 1s, 1954 Patented Dec. 3, 1935 UNITED STATES PATENTOFFICE KNIFE Application October 18, 1934, Serial No. 748,874

2 Claims.

The invention relates to that class of knife wherein the blade isremovably held in place to permit repeated sharpening and replacementwhen occasions require.

The object of the invention is to provide a simple, inexpensive anddurable blade holding handle portion and which at the same time willeffectively and firmly hold the blade in proper position, whilepermitting the blade to be quickly and easily released to permitreplacement of a blade of one type by that of another soas to adapt theknife to different uses.

The invention consists of a knife-handle provided with blade grippingelements r jaws in conjunction with the knife-blade which is providedwith a shank portion of prearranged type adapted to cooperate with thegripping elements which are controlled by pressure applying means.

The objects and advantages of our invention will be readily comprehendedfrom the following detailed description of the accompanyin drawing,wherein#- Figure 1 is a side elevation of a knife with our invention.

Figure 2 is a longitudinal sectional View taken substantially along theline 2-2 of Figure 1.

Figure 3 is a longitudinal sectional view taken substantially along theline 3-3 of Figure 2.

Figure 4 is a cross-sectional View taken substantially on the line 4 4of Figure 3 as viewed by the arrows.

Figure 5 is a detail perspective view of a control disc.

Figure 6 is a detail perspective view of one of the blade grippingelements or jaws, with a portion broken away.

Figure 7 is a longitudinal sectional view of a portion of the handle andof the blade, illustrating a modification.

Figure 8 is a similar View showing another modification.

Figure 9 is a detail sectional View taken substantially on the line 9 9of Figure 8.

In the particular exempliiication of our invention as disclosed in therst six iigures, the handle I5 is of suitable formation and material,such as wood, with one end provided with a bore to receive the shortsleeve member I6.

The sleeve is of length somewhat greater than the depth of the bore inthe handle so as to cause the sleeve to extend beyond the end of thehandle and this extended portion is externally threaded as shown at I'l.

This sleeve receives a pair of jaw members I8, I8` having longitudinallyextending grooves from the outer or small ends to a point adjacent tothe inner or flared ends I9 for the purpose of receiving the knife-bladeor shank oi the blade 2B.

The sleeve I6 and the inner ends I9 of the gripping or jaw members I8are shown secured 5 in the b ore of the handle I5 by a cross-pin 2|,which extends through the ends of both jaw members, through the sleeveand through the handle, thus holding the sleeve and jaw members againstany longitudinal movement as well 10 as against rotative movement.

The outer ends of the jaw members I8, i8, preferably a short distanceremoved from the immediate ends, are each provided with a slight ofi-setor bulge as shown at 22 thereby slightly 15 increasing the depth of thegrooves in the jaws for the purpose of receiving the raised portion 23formed on the opposite longitudinal edges of the shank of lthe blade thedepth of the grooves in the immediate outer ends of the jaws being 20preferably uniform and similar to the depth of the grooves at the innerends of the jaw members.

The threaded outer end of the non-rotatable sleeve I is intended toreceive the internally 25 threaded ferrule or collar 24 which at one endhas an inturned flange as shown in Figures 2 and 3 at 25.

The ferrule or cellar 25 is shown provided with a slotted disc 25,detail of which is shown in Figure 5; and in this instance the disc 26is shown provided with an annular shoulder 21 which is to be engaged bysmall pins 28, 23 secured within the ferrule or collar 24. The pinsextend onto the shoulder of the disc and prevent the disc coming out ofthe ferrule while at the same time permitting rotative movement of theferrule relative tothe disc.

The slot 29 in the disc 26 is of size suflicient to receive the normalsized outer ends of the jaw members I8, i8 and permitting them to passthrough the slot as shown in Figure 3; while on the other hand effectinga wedging relation with the bulging portions 22, 22 of the two jawmembers I8, i8.

The length of the screw-threaded portion of sleeve I6 `and the length offerrule 24 are preferably such that the disc 26 may bey brought intoengagement with the bulged portions 22 of the jaw members I8 before theferrule 24 has been 50 completely screwed onto the sleeve I5. With suchconstruction,` the disc 26 will ride slightly onto the bulged portions22 of the two jaw members and thus force the latter into rmer grippingrelation with the shank of the blade and the bulged portions 22 of thejaw members int iirm relation with the raised portions 23, 23 of theblade-shank and hence prevent the raised portions 23 from leaving thebulged portions of the jaw members and passing through the normal sizedouter ends of the jaws. As a result the blade is rmly held in placeregardless of any strains to which the blade may be subjected.

Instead o securing the disc 25 in the errule 24 by means of the pins 28,the disc 26 may be held in the ferrule 24EL against accidental removalby means of a resilient split ring (see Figure 9) which seats or expandsinto a groove 3| cut in the ferrule beneath the threaded portion. Theknife-blade, like in the previously described construction, passesthrough the slot in the disc and into the jaw members; the slot in thedisc also receiving the outer ends of the jaw members, which are held bythe cross-pin 2l. The disc therefore will be held against rotation;while the ferrule may be screwed onto the threaded end of the sleeve andthereby force the disc lengthwise of the jaw members in the same manneras in the construction shown in Figures Instead of providing both thejaw members and the shank of the knife-blade with the raised or bulgedportions 22 and 23, an interlocking relation between the jaws and knifemay be eiected as shown in Figures '7 and 8. In Figure 7 the knife-bladeshank is shown provided at opposite longitudinal edges with smallprojections 32 which are intended to pass into a socket 33 formed ineach jaw member.

In Figure 8 the blade-shank on opposite longitudinal edges is providedwith notches 34 which are adapted to receive small pins or burrs formedwithin the channels of the jaw members.

It is apparent that with these constructions the knife-blade will befirmly held against outward longitudinal movement as long as the disc isin telescopic relation with the ends of the jaw members, because theslot in the disc is just sufcient to receive the spread ends of the jawmembers produced by the shank of the knife-blade thus firmly holding thegrooved sides of the jawmembers against the longitudinal edges of theshank of the blade.

We are aware that knife-handles for removably holding the blades havebeen made, employing a pair of retractble jaw members whose grippingrelation with the blade is induced by either rotating the blade with thejaw members or by holding the blade against movement and rotating thehandle which causes a threaded stem or bolt secured to the inner ends ofthe jaw members to screw lengthwise of a nut secured in the butt orother end of the handle. This causes the jaw members to be retracted ordrawn into the handle.

This construction, however, has been found objectionable because if theblade is subjected to side pressure in a certain direction the bladewith the jaw members will rotate in an unscrewing direction and theblade will be released.

Our improved construction overcomes this serious objection, as the jawmembers are pivotally held in the handle against any rotary movement bythe cross-pin 2|; the jaw members being xedly held against movementlongitudinally of the handle. As a result, the blade will be heldagainst rotary movement regardless of any sidewlse pressure thereon.Furthermore, it is not necessary to bore out the entire handle and hencea stronger handle is provided.

What we claim is:

1. A knife of the character described comprising a handle counterboredat one end; a tubular member arranged in the bore of the handle andprovided with an externally threaded end adapted to extend beyond thehandle; a pair of longitudinally grooved jaw members arranged in saidtubular member; means whereby the jaw members and the tubular member aresecured in the handle against rotation and against longitudinalmovement, while permitting a separating movement between the jawmembers; a blade having a shank adapted to enter between said jawmembers, the blade-shank and jaw members having interengaging surfacesto prevent longitudinal movement of the knife-blade; a ferrule adaptedto screw onto said threaded end of the tubular member; and a slotteddisc mounted in one end of the ferrule so as to permit independentrotative movement, the slot in the disc being adapted to receive theouter ends of the jaw members with the blade-shank therebetween and tohold the jaw members in gripping relation with the blade-shank when theferrule is screwed onto the tubular member.

2. A knife of the character described comprising a handle portioncounterbored at one end; an externally threaded sleeve in saidcounterbore; a pair of grooved jaw members arranged in said sleeve;means disposed through the handle whereby the sleeve and jaw members areheld in the counterbore against movement longitudinally of the handlewhile the jaw members are permitted lateral spacing movement; aknifeblade insertable between the jaw members, the jaw members andknife-blade being provided with interengaging surfaces; a ferruleadapted to screw lengthwise of the sleeve and having an inturned iiangeat one end; and a disc seated in the ferrule against said flange andslotted to receive the ends of the jaw members when the knife-blade isin place, said disc being held in the errule so as to permit the latterto screw onto said sleeve without rotating the disc.

FRED E. EDGREN. ARTHUR J. LA CROIX.

